Slow Theka

Listen here or download the mp3 (26mb) or wav (144mb)

Slow theka is an improvisation between sarod and computer-generated percussion. It is inspired by the rhythmic feel of the slow metric cycle (vlambit tintal) used in North Indian classical music. Theka means the sequence of strokes used to define a particular rhythmic cycle. Typical stroke patterns are used that define the metre and give the timbral feel of the cycle. A skilled improviser is able to keep the rhythmic and timbral foundation of the cycle while continuously embellishing and responding to the soloist.

We have tried to model this style of improvisation here. Our technique is based on first extracting typical stroke patterns used in accompaniment. These are analyzed according to several musical parameters such as rhythmic complexity and this information is stored along with each phrase. Phrases are then chosen in realtime based on their timbral appropriateness for a given beat as well as by their rhythmic characteristics. We control the overall flow of tension and relaxation by specifying a curve that guides the system in its choices. The rhythmic cycle is essential for controlling the flow of the music and guides listeners' expectations. For example, resolutions typically occur on the first beat of rhythmic cycle.

Melodically the piece is based on Raag Ahir Bhairav and the sarod is processed in realtime, using a variety of granular-synthesis-based techniques. The parameters are modified in realtime by an accompanist.

Finally, there are several textural accompaniments, including a drone, and subtle textural elements which attempt to give a breathing, life-like background to the piece.